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<div class="titlepage"><div><div><h3 class="title">
<a name="asio.reference.ip__multicast__outbound_interface"></a><a class="link" href="ip__multicast__outbound_interface.html" title="ip::multicast::outbound_interface">ip::multicast::outbound_interface</a>
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<p>
<a class="indexterm" name="id1039751"></a>
Socket option for local interface to use
for outgoing multicast packets.
</p>
<pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">implementation_defined</span> <span class="identifier">outbound_interface</span><span class="special">;</span>
</pre>
<p>
Implements the IPPROTO_IP/IP_MULTICAST_IF socket option.
</p>
<a name="asio.reference.ip__multicast__outbound_interface.examples"></a><h5>
<a name="id1039797"></a>
<a class="link" href="ip__multicast__outbound_interface.html#asio.reference.ip__multicast__outbound_interface.examples">Examples</a>
</h5>
<p>
Setting the option:
</p>
<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">);</span>
<span class="special">...</span>
<span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">address_v4</span> <span class="identifier">local_interface</span> <span class="special">=</span>
<span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">address_v4</span><span class="special">::</span><span class="identifier">from_string</span><span class="special">(</span><span class="string">"1.2.3.4"</span><span class="special">);</span>
<span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">multicast</span><span class="special">::</span><span class="identifier">outbound_interface</span> <span class="identifier">option</span><span class="special">(</span><span class="identifier">local_interface</span><span class="special">);</span>
<span class="identifier">socket</span><span class="special">.</span><span class="identifier">set_option</span><span class="special">(</span><span class="identifier">option</span><span class="special">);</span>
</pre>
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<a class="link" href="ip__multicast__outbound_interface.html#asio.reference.ip__multicast__outbound_interface.requirements">Requirements</a>
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<p>
<span class="bold"><strong>Header: </strong></span><code class="literal">asio/ip/multicast.hpp</code>
</p>
<p>
<span class="bold"><strong>Convenience header: </strong></span><code class="literal">asio.hpp</code>
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<td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 Christopher M. Kohlhoff<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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